IR upgrades Kavach 3.2 to Kavach 4.0 on Malkajgiri-Kamareddi section in Telangana September 25, 2026 | News & Developments, S & T Indian Railways (IR) has upgraded Kavach 3.2 to advanced Kavach 4.0 over 108 route km (rkm) of Malkajgiri-Kamareddi section ….. This content is restricted.